Threaded holes are found in almost every type of machined product, from aluminum electronics housings and robotic components to stainless steel valve bodies, automotive brackets, optical mounts, and industrial fixtures. Although the finished feature may look simple, producing a reliable internal thread involves much more than selecting the correct nominal thread size.
The type of tap used can influence chip evacuation, cutting torque, thread quality, tool life, and the risk of breaking a tool inside the workpiece. A tap that performs well in a through hole may create serious chip-packing problems in a blind hole. Likewise, a thread-forming tap that performs efficiently in a ductile aluminum alloy may be unsuitable for a brittle material.
For this reason, machinists use many different types of taps. The correct choice depends on the hole geometry, workpiece material, required thread depth, chip behavior, machine conditions, and production method.
This guide from Tuofa CNC 독일 explains 15 common types of thread taps, how they differ, and how manufacturers choose a suitable tapping strategy for CNC machined parts.
What Is a Thread Tap?
A thread tap is a tool used to produce an internal thread inside a prepared hole. The resulting thread allows screws, bolts, fittings, studs, and other externally threaded components to engage with the machined part.
A typical machining sequence is:
- Drill or machine the hole to the required diameter.
- Chamfer or prepare the hole entrance when necessary.
- Run the tap into the hole to generate the internal thread.
- Retract the tool while maintaining the correct relationship between spindle rotation and feed.
- Inspect the finished thread when required by the drawing or quality plan.
A tap normally contains a shank, threaded cutting or forming section, chamfer, and—on cutting taps—flutes that provide cutting edges and chip space.
A tap should not be confused with a die. A tap produces internal threads, while a die is generally used to produce external threads.
Why Are There So Many Different Types of Taps?
Different tap designs exist because not every threaded hole creates the same machining conditions. One of the biggest differences is how chips must be managed.
In a through hole, chips may be pushed forward and allowed to leave the opposite side of the workpiece. In a blind hole, however, there is no exit at the bottom. If chips are forced downward, they can accumulate between the tap and the bottom of the hole, increasing torque and potentially breaking the tool.
Tap selection is also affected by material behavior. Aluminum, stainless steel, carbon steel, brass, bronze, and cast iron do not generate the same type of chips or cutting forces. Ductile materials may also permit thread forming instead of conventional thread cutting.
Other important factors include:
- Blind hole or through hole
- Required full thread depth
- Available clearance below the thread
- Workpiece hardness and ductility
- Chip length and chip-breaking behavior
- Cutting or forming process
- CNC machine rigidity
- Tool runout
- Lubrication and coolant delivery
- Production quantity
- Thread tolerance and inspection requirements
15 Different Types of Thread Taps
1. Hand Taps
Hand taps are one of the most familiar groups of threading tools. A traditional hand tap set commonly contains taper, plug, and bottoming taps. The key difference between these tools is the length of the chamfered cutting section.
Although the name suggests manual use, understanding these three chamfer styles is also useful when selecting taps for machine operations.
Taper Tap
A taper tap has a relatively long chamfer. Because several teeth gradually enter the cut, the load is distributed over a longer section of the tool.
This gradual engagement can make a taper tap easier to start and align, particularly in manual threading operations. It is useful when reducing initial cutting load is more important than producing full threads close to the bottom of the hole.
The disadvantage becomes obvious in shallow blind holes. Because the first portion of the tap contains incomplete cutting teeth, a taper tap requires additional axial space before a fully formed thread is produced.
Plug Tap
A plug tap uses a shorter chamfer than a taper tap and is often considered a general-purpose option. It provides a compromise between gradual cutting engagement and the ability to produce complete threads deeper into a hole.
Plug taps can be used in many through-hole applications and in blind holes when sufficient clearance remains below the required thread depth.
Bottoming Tap
A bottoming tap has a very short chamfer. This allows full thread geometry to be produced much closer to the bottom of a blind hole.
That does not necessarily mean it is the best tool for starting every thread. Because fewer chamfered teeth share the initial cutting load, torque can be higher. Bottoming taps are therefore commonly associated with applications where full thread depth near the bottom is particularly important.
2. Pipe Tap
Pipe taps are used to produce internal pipe threads rather than conventional machine-screw threads. Depending on the required standard, these may include tapered thread forms such as NPT or other pipe-thread specifications.
Pipe threads are widely used in fluid, pneumatic, hydraulic, and pressure-related systems. Their functional requirements can differ significantly from ordinary fastening threads because engagement and sealing may both be important.
The correct tap must therefore correspond to the thread standard shown on the engineering drawing. A standard metric or UNC machine-screw tap should not be treated as interchangeable with a pipe tap simply because the nominal dimensions appear similar.
3. Spiral Flute Tap
A spiral flute tap has helical flutes that help move chips backward toward the entrance of the hole.
This chip direction is one of its most important characteristics.
Spiral flute taps are commonly selected for blind-hole tapping because they help pull chips upward and out of the hole.
Without effective chip evacuation, chips can collect at the bottom of a blind hole. The tap may then compress or recut the accumulated chips, increasing torque, damaging the thread, or causing tool failure.
Spiral flute taps are therefore frequently used in CNC machining where controlled chip evacuation from blind threaded holes is required.
The helix angle, flute design, tap material, coating, workpiece material, hole depth, and cutting conditions must still be considered. A spiral flute design does not automatically solve every blind-hole tapping problem.
4. Gas Tap
Gas taps are specialized threading tools associated with certain pipe, gas, pneumatic, and fluid connection thread systems.
They are considerably more application-specific than general machine taps. When a component requires a gas or pipe connection, the tap should be selected according to the exact thread specification on the engineering drawing rather than according to nominal hole diameter alone.
5. Machine Tap
Machine taps are designed for powered tapping operations rather than primarily for manual threading. They are commonly used with machining centers, tapping machines, lathes, and other production equipment.
Compared with basic manual threading, CNC machine tapping typically requires greater process repeatability. Tool geometry must suit the hole type and material, while machine synchronization, runout, coolant delivery, and tool condition also become important.
Machine taps may be manufactured from high-speed steel, cobalt-containing grades, carbide, or other tooling materials and may use coatings such as TiN or TiCN depending on the application.
6. Thread-Forming Tap
A thread-forming tap works differently from a conventional cutting tap.
Instead of removing material to create the thread profile, it plastically displaces the workpiece material into the required thread shape. For this reason, it is also commonly called a form tap, forming tap, 또는 roll tap.
One important advantage is that conventional cutting chips are not produced. This can make forming attractive for some blind-hole applications where chip control would otherwise be difficult.
However, the workpiece material must have sufficient ductility to deform properly. Form tapping is therefore more appropriate for some aluminum alloys, steels, and other formable materials than for brittle materials that cannot tolerate the required plastic deformation.
Another critical consideration is the pre-hole diameter.
A form tap generally requires a different tap-drill diameter from a cutting tap.
Because material is displaced rather than removed, the amount of material left around the hole must be carefully controlled. A hole that is too small can dramatically increase forming torque, while an incorrect hole size can also affect the finished thread.
Lubrication and machine torque capability are also particularly important in thread forming.
7. Master Tap
Master taps are specialized threading tools designed for demanding thread-generation applications. Designs may use multiple cutting flutes to improve cutting action and control the finished thread.
They are less common in everyday general-purpose CNC work than spiral flute, spiral point, plug, or forming taps, but they can be relevant in specialized manufacturing operations where thread accuracy or difficult material conditions require an appropriate tool design.
8. Combined Drill and Tap
A combined drill and tap incorporates drilling and threading functions into one tool. In suitable applications, this can reduce tool changes and shorten cycle time.
For simple holes and compatible part geometries, combining operations can improve production efficiency. However, it is not automatically the best solution for every precision CNC component.
Deep threads, difficult materials, demanding positional tolerances, unusual hole geometries, or stringent thread inspection requirements may make separate drilling and tapping operations preferable because each operation can be optimized independently.
9. Solid Carbide Tap
Solid carbide taps provide high hardness, wear resistance, and good dimensional stability. They can be useful in demanding production environments and when machining abrasive or relatively hard workpiece materials.
Carbide, however, is less tolerant of shock than tougher high-speed-steel tooling. A rigid machine, accurate alignment, low runout, and a stable tapping cycle become especially important.
A carbide tap is therefore not automatically a better choice simply because carbide is harder. Tool material should match the machine, workpiece, thread geometry, production quantity, and process stability.
10. Extension Tap
An extension tap has a longer reach than a standard tap and is used when the threaded hole is located inside a recessed or difficult-to-access region of the component.
Applications may include deep bosses, pulley hubs, internal recesses, or parts where surrounding geometry prevents a conventional tap holder from approaching the feature.
Long-reach tooling should be used carefully because additional tool length can reduce rigidity and increase sensitivity to alignment.
From a CNC design-for-manufacturing perspective, threaded-hole accessibility should ideally be considered during part design. Making a hole extremely difficult to reach can increase tooling complexity and machining cost even if an extension tap makes the feature technically possible.
11. Fluteless Tap
The term fluteless tap is commonly associated with thread-forming technology. Unlike conventional cutting taps, these tools do not require large flutes for carrying cutting chips because the thread is generated through material deformation.
이러한 이유로, fluteless tap 그리고 form tap may describe closely related or overlapping tooling concepts depending on the manufacturer and application.
The important distinction for a CNC engineer is not the name alone, but whether the tool cuts material or forms it.
Forming requires suitable material ductility, correct hole sizing, adequate lubrication, and sufficient torque from the machine.
12. Machine Screw Tap
Machine screw taps are commonly associated with producing internal threads for machine screws and general fastening applications. They may be used in maintenance, repair, toolroom work, or lower-volume threading operations.
The term should not be confused with the broader concept of a machine tap. A machine tap primarily describes tooling intended for powered tapping, whereas a machine screw tap is associated more closely with the type of thread and traditional threading application.
13. Spiral Point Tap
A spiral point tap is another important tap type in CNC manufacturing. It is often called a gun tap.
Unlike a spiral flute tap, which pulls chips toward the entrance of the hole, a spiral point tap is designed to direct chips forward ahead of the tool.
This makes it particularly useful for through holes because chips can continue through the bottom of the workpiece instead of having to travel back along the tap flutes.
Spiral point tap → pushes chips forward → commonly used for through holes.
The forward chip flow also allows the flute geometry to maintain relatively strong cutting sections, making spiral point taps efficient for many production tapping applications.
14. Stay Bolt Tap
A stay bolt tap is a long, specialized tap historically associated with threading holes for stay bolts and related repair or manufacturing operations.
It is not one of the most commonly encountered tools in modern general-purpose CNC machining, but it remains an example of how tap designs can be adapted for specific thread locations and industrial applications.
15. Interrupted Thread Tap
An interrupted thread tap removes or interrupts sections of the normal cutting tooth pattern.
This creates additional space that can improve chip control, chip breaking, and lubricant access under certain machining conditions.
Such designs can be valuable when continuous cutting edges would create undesirable friction or chip behavior. As with other specialized taps, the benefit depends on the workpiece material and exact threading application.
Spiral Flute Tap vs Spiral Point Tap
Spiral flute and spiral point taps are sometimes confused because both names contain the word “spiral,” but their chip-control strategies are fundamentally different.
| 특징 | Spiral Flute Tap | Spiral Point Tap |
|---|---|---|
| Chip direction | Pulls chips backward toward hole entrance | Pushes chips forward |
| Common hole type | Blind holes | Through holes |
| 주요 이점 | Removes chips from a closed-bottom hole | Moves chips through the opposite side |
| 전형적인 우려 사항 | Helical cutting edges and chip evacuation | Requires room for chips to exit forward |
A useful starting rule is:
Blind hole: consider a spiral flute tap.
Through hole: consider a spiral point tap.
However, these are general machining principles rather than universal rules. Material, thread size, depth, machine condition, coolant, tool manufacturer recommendations, and required thread tolerance must also be considered.
Cutting Tap vs Forming Tap
The difference between cutting and forming is one of the most important decisions in thread machining.
Cutting Tap
A cutting tap removes material to create the thread profile. As a result, chips are generated and must be evacuated from the hole.
Its advantages include broad material compatibility and a wide range of available geometries for blind holes, through holes, and specialized applications.
Forming Tap
A forming tap displaces material instead of cutting it. Conventional chips are therefore not generated.
This can improve process reliability in appropriate materials, especially when eliminating chip accumulation is valuable. Forming can also produce a different material flow around the thread profile compared with cutting.
However, forming generally requires:
- A sufficiently ductile workpiece material
- Correct pre-hole diameter
- Good lubrication
- Sufficient machine torque
- Stable tool alignment
Neither process is universally superior. The correct choice depends on the material and application.
How to Choose the Right Thread Tap
Choosing the correct tap starts with the machining conditions rather than the tap name. The following sequence provides a practical approach.
1. Determine Whether the Hole Is Blind or Through
This is often the first major decision because it determines the available direction for chip evacuation.
A blind hole has no exit at the bottom. Chips must therefore be controlled so that they do not accumulate below the tap.
A through hole allows chips to pass through the workpiece, making forward chip evacuation possible.
2. Consider the Workpiece Material
알루미늄
Many aluminum alloys machine relatively easily, but their ductility can create long chips and they may have a tendency to adhere to tooling under unsuitable conditions. Tool geometry and lubrication should therefore be chosen carefully.
Some aluminum alloys are also good candidates for form tapping when the application, alloy, hole size, and thread requirements permit it.
강철
Steel grades vary greatly in hardness and machinability. A low-carbon steel does not create the same tapping conditions as hardened alloy steel.
As hardness and strength increase, tool wear, cutting torque, machine stability, and tooling material become increasingly important.
스테인리스강
Stainless steels can be challenging because many grades generate heat and can work harden if the cutting process is unstable.
Sharp tooling, appropriate speed, effective lubrication, and reliable chip evacuation are particularly important.
주철
Cast iron generally produces shorter, more brittle chips than many ductile metals, but abrasive wear may become an important tooling consideration.
Brass and Bronze
Machinability varies significantly between individual copper alloys. Tap geometry should therefore be based on the actual material grade rather than simply classifying every brass or bronze alloy in the same way.
3. Decide Between Cutting and Forming
If the material has suitable ductility and the application benefits from chipless thread generation, forming may be considered.
If the material cannot deform reliably, or if the thread specification and manufacturing conditions favor material removal, a cutting tap may be more appropriate.
4. Evaluate Thread Depth
Thread depth has a major effect on tapping difficulty, particularly in blind holes.
As holes become deeper, it becomes increasingly difficult to:
- Evacuate chips
- Deliver lubrication
- Control torque
- Prevent chip recutting
- Maintain tool reliability
Designers should also distinguish between thread depth 그리고 total hole depth. They are not necessarily the same dimension.
A blind hole often requires additional clearance below the specified full thread depth for the tap chamfer and chip space.
5. Choose the Tap Material
고속도 공구강
HSS taps combine useful toughness with good general-purpose cutting performance and are widely used for many tapping applications.
Cobalt HSS
Cobalt-containing high-speed steel can provide improved hot hardness and wear resistance in more demanding materials.
카바이드
Carbide offers high wear resistance and dimensional stability but requires stable machining conditions because it is more sensitive to shock and misalignment.
6. Consider the Tool Coating
Coatings such as TiN, TiCN, and other application-specific coatings may help reduce friction or improve wear resistance.
The most suitable coating depends on the workpiece material, lubricant, operating temperature, and tool geometry. A coating cannot compensate for an incorrect tap design or poor machining conditions.
Blind Hole vs Through Hole Tapping
Blind Hole Tapping
Blind holes present several challenges:
- Chips cannot exit through the bottom.
- The tap must stop before contacting the bottom of the drilled hole.
- Chamfer length affects how close full threads can reach the bottom.
- Chip accumulation can increase torque.
- Thread depth and drilled-hole depth must be coordinated.
Depending on the application, spiral flute taps, bottoming taps, or form taps may be considered.
Through Hole Tapping
Through holes provide a path for chips to leave the opposite side of the workpiece. This makes spiral point taps particularly useful because they can push chips forward.
The designer should still ensure that sufficient clearance exists behind the hole for the tap and chips.
Why Tap Chamfer Length Matters
The difference between taper, plug, and bottoming taps is strongly related to chamfer length.
A longer chamfer allows more teeth to share the cutting load. This reduces the amount of material removed by each individual tooth and generally provides smoother engagement.
A shorter chamfer reaches complete thread geometry more quickly, which is valuable near the bottom of a blind hole. However, fewer teeth participate in the initial cut, increasing the load on those cutting edges.
This is why the shortest tap is not automatically the best choice. Tool geometry should match the required thread depth and available hole clearance.
What Do Thread Tap Markings Mean?
Tap shanks commonly contain markings that identify important tool information. Depending on the manufacturer and thread system, these may include:
- Nominal thread diameter
- Thread pitch or threads per inch
- Metric, UNC, UNF, or another thread form
- Tool material
- Pitch diameter or tolerance designation
- Manufacturer identification
For example, a tap marked with a metric diameter and pitch indicates the thread geometry it is designed to produce. Additional markings may define tolerance or tool limits.
Machinists should verify these markings against the engineering drawing before machining production parts.
What Are Pitch Diameter Limits on Taps?
The pitch diameter of an internal thread is a critical functional dimension because it influences how the mating external thread fits and engages.
Some tap systems use H or L limits to describe how the tap’s pitch diameter relates to the basic thread size. In general, progressively higher H designations represent increasing pitch diameter above the basic reference size.
The correct tap limit cannot be selected solely by choosing the largest or smallest designation. The final requirement can depend on:
- Required thread class
- Workpiece material
- Material recovery or springback
- Tool coating
- 공구 마모
- Final inspection requirement
For precision CNC components, the engineering drawing and applicable thread standard should control the final selection.
Common CNC Tapping Problems
파손된 탭
Tap breakage is one of the most expensive threading failures because part removal and tool extraction can be difficult.
Possible causes include:
- Incorrect tap-drill diameter
- Poor chip evacuation
- Excessive torque
- Insufficient lubrication
- 공구 마모
- Incorrect cutting conditions
- Spindle-feed synchronization errors
- Misalignment or excessive runout
- Insufficient clearance at the bottom of a blind hole
Oversized Threads
If the finished internal thread is too large, possible causes include tool runout, incorrect tool selection, excessive tool wear, machine alignment problems, or an unsuitable pitch-diameter limit.
Rough or Torn Threads
Poor surface quality may result from worn cutting edges, chip recutting, inadequate lubrication, unstable machining, or inappropriate geometry for the workpiece material.
Chip Packing in Blind Holes
Chip packing is especially dangerous in deep blind holes. Once chips accumulate below the cutting section, tapping torque can increase rapidly.
This is one reason why choosing the correct chip direction is so important. A spiral flute tap can help transport chips back toward the hole entrance instead of pushing them deeper into the blind hole.
Why Tap Drill Size Matters
The diameter of the hole before tapping directly influences the amount of material the tap must cut or form.
An unsuitable hole diameter can affect:
- Thread percentage
- Tapping torque
- 공구 수명
- Risk of tap breakage
- Finished thread geometry
This issue becomes particularly important when comparing cutting taps and forming taps.
A tap-drill size intended for a cutting tap should not automatically be used for a form tap.
The appropriate pre-hole diameter should be selected according to the actual thread standard, workpiece material, tapping method, desired thread engagement, and tool manufacturer’s recommendations.
CNC Tapping Considerations
Machine Rigidity
A stable CNC machine helps maintain tool alignment and consistent cutting conditions. This becomes increasingly important when tapping hard materials, small threads, or deep holes.
Rigid Tapping
Modern CNC machining centers commonly use rigid tapping, in which spindle rotation and axial feed are synchronized. The feed rate must correspond correctly to the thread pitch so that the tap advances one pitch per spindle revolution.
Poor synchronization can place excessive axial load on the tool and damage the thread or tap.
Tool Runout
Excessive runout causes unequal loading around the tap. This may reduce tool life and negatively affect thread accuracy.
냉각유 및 윤활
Tapping creates significant friction because multiple teeth remain in contact with the workpiece. Proper lubrication can reduce friction, control temperature, assist chip evacuation, and improve thread finish.
The correct lubricant depends on the workpiece material and whether the thread is cut or formed.
Tool Life Monitoring
In production machining, a tap should ideally be replaced before catastrophic failure occurs. Monitoring tool life is particularly valuable because a worn tap can damage many threaded holes before it finally breaks.
Thread Tap Selection Quick Guide
| 적용 분야 | Common Tap Choice | Main Reason |
|---|---|---|
| Starting a thread manually | Taper tap | Gradual cutting engagement |
| General-purpose threading | Plug tap | Balanced chamfer design |
| Full thread near blind-hole bottom | Bottoming tap | Very short chamfer |
| Blind-hole CNC tapping | Spiral flute tap | Pulls chips toward hole entrance |
| Through-hole CNC tapping | Spiral point tap | Pushes chips forward through the hole |
| Ductile material with chipless tapping | Thread-forming tap | Forms rather than cuts material |
| Hard or abrasive production application | Carbide tap | High wear resistance when conditions are stable |
| Hard-to-reach thread | Extension tap | Additional tool reach |
| Pipe connection | Pipe tap | Produces the specified pipe-thread geometry |
This table provides a starting point rather than a universal selection rule. The final tool must still match the material, machine, thread specification, hole depth, tolerance, lubrication, and production environment.
Designing Threaded CNC Parts for Reliable Machining
When a CNC machined part contains threaded holes, manufacturing difficulty depends on much more than the nominal thread designation.
에 Tuofa CNC 독일, a threaded feature may need to be evaluated together with the surrounding part geometry and machining process. Important drawing information includes:
- Thread standard
- Nominal thread diameter
- Pitch or threads per inch
- Thread tolerance or class
- Blind or through-hole condition
- Required full thread depth
- Total drilled-hole depth
- Workpiece material
- Feature accessibility
- Production quantity
For example, specifying a deep blind M-thread inside an aluminum electronics housing may require a very different machining strategy from producing the same nominal thread through a steel bracket.
The same principle applies to stainless steel valve components, robotic parts, optical mounts, industrial fixtures, threaded shafts, and automotive components. The thread designation may be identical, while the preferred tap geometry, tool material, coolant strategy, and cutting parameters are completely different.
Designers should therefore avoid defining only the thread depth while leaving insufficient drilled-hole clearance below it. A tap needs space for its chamfer, and a cutting tap may also require room for chips.
Considering these factors during DFM can reduce machining risk and make threaded features more practical to manufacture.
Frequently Asked Questions About Different Types of Taps
What are the three main types of hand taps?
The three traditional hand tap styles are taper taps, plug taps, and bottoming taps. Their main difference is chamfer length. Taper taps engage gradually, plug taps provide a general-purpose compromise, and bottoming taps can produce complete threads closer to the bottom of a blind hole.
What tap is best for a blind hole?
A spiral flute tap is commonly used for CNC blind-hole tapping because it helps pull chips toward the hole entrance. A bottoming tap may be needed when full thread geometry must extend close to the bottom. Form taps can also be effective in suitable ductile materials because they do not generate conventional cutting chips.
What tap is best for a through hole?
A spiral point tap is commonly used because it pushes chips forward through the hole. This prevents chips from having to travel backward through the tap flutes.
What is the difference between a spiral point tap and a spiral flute tap?
The key difference is chip direction. A spiral flute tap generally pulls chips backward toward the hole entrance, making it useful for blind holes. A spiral point tap pushes chips forward, making it particularly suitable for through holes.
What is a bottoming tap used for?
A bottoming tap is used when full threads are required close to the bottom of a blind hole. Its short chamfer reaches complete thread geometry sooner than a taper or plug tap.
Can a form tap be used in a blind hole?
Yes, when the material and process are suitable. Because a form tap does not generate conventional cutting chips, it can be attractive for blind-hole applications. However, correct pre-hole diameter, material ductility, lubrication, machine torque, and tool recommendations are essential.
Do form taps produce chips?
Form taps do not produce conventional cutting chips because they generate the thread by plastically displacing the workpiece material rather than removing it.
What is the difference between a cutting tap and a forming tap?
A cutting tap removes material and generates chips. A forming tap displaces material to create the thread profile. Cutting taps can be used with a broader range of materials, while form tapping requires materials with sufficient ductility.
Can the same tap be used for aluminum and stainless steel?
Possibly in some general applications, but it is not always the best manufacturing choice. Aluminum and stainless steel have different cutting behavior, friction characteristics, heat generation, and chip formation. Tool geometry, coating, lubrication, and machining conditions should therefore be selected according to the actual material.
Why do taps break?
Common causes include an undersized pre-hole, packed chips, incorrect tap geometry, inadequate lubrication, excessive cutting speed, tool wear, insufficient blind-hole clearance, runout, misalignment, or poor synchronization between spindle rotation and feed.
결론
There is no single thread tap that is best for every CNC machining application. Choosing among different types of taps requires an understanding of how the hole, material, machine, and tool interact.
For blind holes, chip removal toward the entrance often favors spiral flute designs. For through holes, spiral point taps can push chips forward. Bottoming taps help produce complete threads closer to the bottom of a blind hole, while thread-forming taps provide a chipless alternative for suitable ductile materials.
The workpiece material, thread depth, tap material, tool coating, lubrication, pre-hole diameter, runout, and machine rigidity must also be considered.
For custom CNC parts, tapping should therefore be treated as part of the complete manufacturing strategy rather than as an isolated finishing operation.
Tuofa CNC 독일 provides custom CNC machining for precision components with internal and external threaded features. Evaluating thread depth, hole geometry, accessibility, workpiece material, and production requirements during DFM helps reduce tapping risks and improve the manufacturability of the finished part.